Building block configuration



FIG. 1 is a front perspective view of a building block configurationshowing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

CLAIM The ornamental design for a building block configuration, as shownand described.